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AI chat · GPT-6

Chat with GPT-6 online

3 GPT-6 models in llmwise, 2 of them in the 5 free messages you get on sign-up. GPT-6 Astra passed 48 of 50 of our test prompts, the most of any GPT-6 model.

A real answer from our test runs

GPT-6 Sol

Write a JavaScript function slugify(title) that turns a title into a URL slug: - lowercase; - letters with accents become the plain letter (é → e, ñ → n, ü → u); - every run of characters that isn't a–z or 0–9 becomes a single hyphen; - no hyphen at the start or the end. For example, slugify("Hello, World!") returns "hello-world" and slugify(" Crème brûlée: 3 ways ") returns "creme-brulee-3-ways". Reply with the whole function in one ```javascript code block: plain JavaScript for Node.js 22, no imports, no TypeScript.

GPT-6 Sol · passed our check · September 27, 2026

```javascript
function slugify(title) {
  return title
    .normalize("NFD")
    .replace(/\p{M}/gu, "")
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, "-")
    .replace(/^-|-$/g, "");
}
```

Ask GPT-6 Sol your own question: it's in the 5 free messages you get on sign-up, no card.

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Facts about other apps checked against ChatGPT pricing. Updated .

Short answer

GPT-6 Astra passed the most of our test prompts, 48 of 50; GPT-6 Luna 47 of 50 and GPT-6 Sol 45 of 50. GPT-6 Sol and GPT-6 Luna are in the 5 free messages you get on sign-up.

The GPT-6 models in llmwise

Every GPT-6 model in llmwise: the free trial, Pro's count, a typical message at its API price, and our test results.

The GPT-6 models
ModelFree trialOn ProTypical message, API priceOur test prompts passed
GPT-6 AstraOpenAINo31 a month$0.075048 of 50 (20 of 20 hard)
GPT-6 SolOpenAIYes125 a month$0.015045 of 50 (19 of 20 hard)
GPT-6 LunaOpenAIYes60 a day$0.000847 of 50 (20 of 20 hard)

On Pro: the most messages a month on the model if the month goes to it alone, or a day's on an everyday model. The API price is a 4,000-token question with a 700-token answer at the model's list price as of September 2026; in llmwise you pay per message. Our tests: the 50 prompts of our test runs on September 27, 2026.

Every limit is published. Paid plans also have a monthly fair-use limit on AI cost: Pro $7.50, Max $20, Ultra $42, Studio $85. Using every message on your plan at typical sizes stays under it; very large messages and heavy research use it faster. Every limit, explained.

GPT-6, job by job

Prompts passed on each of our 10 jobs, 5 prompts a job.

Prompts passed on each job, by model
JobGPT-6 AstraGPT-6 SolGPT-6 Luna
Coding5 of 55 of 55 of 5
Writing5 of 54 of 55 of 5
Math5 of 55 of 54 of 5
Summarization5 of 54 of 54 of 5
Data analysis5 of 55 of 55 of 5
Customer support3 of 53 of 54 of 5
Translation5 of 54 of 55 of 5
SQL5 of 55 of 55 of 5
RAG and answering from documents5 of 55 of 55 of 5
Agents and tool use5 of 55 of 55 of 5

When to pick which GPT-6 model

Among the GPT-6 models only: the one that passed the most of each job, and when others tie, the one that costs less.

  • Coding

    GPT-6 Luna, 5 of 5 passed (2 of 2 hard). GPT-6 Sol and GPT-6 Astra passed as many; GPT-6 Luna costs less.

  • Writing

    GPT-6 Luna, 5 of 5 passed (2 of 2 hard). GPT-6 Astra passed as many; GPT-6 Luna costs less.

  • Math

    GPT-6 Sol, 5 of 5 passed (2 of 2 hard). GPT-6 Astra passed as many; GPT-6 Sol costs less.

  • Summarization

    GPT-6 Astra, 5 of 5 passed (2 of 2 hard).

  • Data analysis

    GPT-6 Luna, 5 of 5 passed (2 of 2 hard). GPT-6 Sol and GPT-6 Astra passed as many; GPT-6 Luna costs less.

  • Customer support

    GPT-6 Luna, 4 of 5 passed (2 of 2 hard).

  • Translation

    GPT-6 Luna, 5 of 5 passed (2 of 2 hard). GPT-6 Astra passed as many; GPT-6 Luna costs less.

  • SQL

    GPT-6 Luna, 5 of 5 passed (2 of 2 hard). GPT-6 Sol and GPT-6 Astra passed as many; GPT-6 Luna costs less.

  • RAG and answering from documents

    GPT-6 Luna, 5 of 5 passed (2 of 2 hard). GPT-6 Sol and GPT-6 Astra passed as many; GPT-6 Luna costs less.

  • Agents and tool use

    GPT-6 Luna, 5 of 5 passed (2 of 2 hard). GPT-6 Sol and GPT-6 Astra passed as many; GPT-6 Luna costs less.

GPT-6 on one prompt, side by side

The same hard translation prompt, “Idioms into natural Japanese”, sent to GPT-6 Astra, GPT-6 Sol, and GPT-6 Luna: GPT-6 Astra passed, GPT-6 Sol failed, and GPT-6 Luna passed.

The prompt: Idioms into natural Japanese (hard)
Translate this into natural Japanese for a business email. Convey what the idioms mean rather than translating them word for word, and keep the numbers.

Kenji, thanks for jumping in at the last minute. The new hire hit the ground running, so we're ahead of schedule. Can you give me a ballpark figure for the Osaka launch budget by the 20th? No need to boil the ocean: a rough number within 10% is fine.

  • GPT-6 Astra

    Passed: Back-translation chrF 0.44 (pass at 0.4).

    健二さん

急なお願いにもかかわらず、ご対応いただきありがとうございます。新しく入ったメンバーが早速活躍してくれているおかげで、予定より早く進んでいます。

大阪での立ち上げ予算について、20日までに概算をいただけますか。細部まで詰めていただく必要はなく、誤差が10%以内に収まる程度の概算で問題ありません。

よろしくお願いいたします。

    431 tokens in, 114 out · 3.2 s · $0.0100 · 1 message on Pro · answered by openai/gpt-6-astra via OpenAI ·

  • GPT-6 Sol

    Failed: Back-translation chrF 0.40 (pass at 0.4); reads back too far from the original.

    健二さん

急なお願いにもかかわらず、ご対応いただきありがとうございます。新しく入った方が早速活躍してくれているおかげで、予定より順調に進んでいます。

大阪での立ち上げにかかる予算の概算を、20日までに教えていただけますか。細かく積み上げる必要はなく、実際の金額との差が10％以内に収まる程度の数字で大丈夫です。

よろしくお願いいたします。

    431 tokens in, 121 out · 2.4 s · $0.0021 · 1 message on Pro · answered by openai/gpt-6-sol via OpenAI ·

  • GPT-6 Luna

    Passed: Back-translation chrF 0.55 (pass at 0.4).

    健司さん、直前の依頼に対応してくれてありがとうございます。新しく入ったメンバーが早速活躍してくれたおかげで、予定より前倒しで進んでいます。20日までに、大阪でのローンチにかかる予算の概算を出してもらえますか。細部まで詰める必要はありません。10％以内の誤差であれば、大まかな金額で大丈夫です。

    431 tokens in, 113 out · 1.6 s · $0.0001 · 1 message on Pro · answered by openai/gpt-6-luna via OpenAI ·

OpenAI's own app

llmwise isn't OpenAI's app. ChatGPT, OpenAI's own, has a free tier too; in its words: “The free version of ChatGPT is available to everyone.” (ChatGPT pricing, checked ).

Where your messages go

In llmwise, a message to GPT goes to its maker, OpenAI, or through OpenRouter when llmwise can't reach the maker directly. The Privacy Policy has the details.

More ways to chat

The other chat pages, each with its own models and test results.

Questions

Can I chat with GPT-6 for free?

Yes, to try: GPT-6 Sol and GPT-6 Luna are in the 5 free messages you get when you sign up, once and with no card. GPT-6 Astra needs a paid plan, from $20 a month. The free-message box on this page, when it shows, is answered by GPT-6 Luna, one of the GPT-6 models.

Is this the official GPT-6 app?

No. llmwise isn't made by OpenAI and isn't affiliated with it: it offers OpenAI's GPT-6 models next to 6 other AI families, in one chat. OpenAI's own app has a free tier too; in its words: “The free version of ChatGPT is available to everyone.” (ChatGPT pricing, checked September 28, 2026).

Which GPT-6 model should I use?

In our test runs on September 27, 2026, GPT-6 Astra passed the most: 48 of 50 prompts. GPT-6 Luna, an everyday model, passed 47 of 50 and counts against 60 a day on Pro. The cheapest per message, GPT-6 Luna, passed 47 of 50. Start on the cheaper one and switch when an answer isn't good enough: the next model sees the whole chat.

Where do my GPT-6 messages go?

In llmwise, a message to GPT goes to its maker, OpenAI, or through OpenRouter when llmwise can't reach the maker directly.

Claude, GPT, Gemini, DeepSeek, Grok, Kimi, and GLM, in one chat.

See what a message costs before you send it. Free is 5 messages to try; sign in with an email link, no password or card.

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